4 Specifications
4.1 Absolute Maximum Specifications
Operating temperature, Ta............................................................................. -40
o
~ +85
o
C
Storage temp, Ts.................................................................................... -50
o
~ +125
o
C
Vdd..................................................................................................-0.3 ~ +6.0V
Max continuous pin current, any control or drive pin............................................................ ±20mA
Short circuit duration to ground or Vdd, any pin.................................................................infinite
Voltage forced onto any pin..................................................................-0.3V ~ (Vdd + 0.3) Volts
4.2 Recommended Operating Conditions
Operating temperature, Ta............................................................................. -40
o
~ +85
o
C
V
DD................................................................................................. +2.8 ~ +5.0V
Short-term supply ripple+noise.............................................................................. ±5mV/s
Long-term supply stability.................................................................................. ±100mV
Cs range................................................................................................. [100nF
Cx range................................................................................................ 0 ~ 50pF
4.3 AC Specifications
Vdd = 5.0V, Ta = recommended, Cx = 5pF, Cs = 4.7nF; circuit of Figure 1.1
baud38,4008,000Serial communications speedbps
µs1External reset low pulse widthTres
End of touchms
14
Release time - Normal modeTdrn
End of touchms
10
Release time - Fast modeTdrf
110ms LP settingms
110
Response time - LP modeTdtl
ms
28
Response time - Normal modeTdtn
ms
14
Response time - Fast modeTdtf
All three bursts ms
2.5
Burst durationTbd
ms
260
Startup time from cold startTsu
Pulses appear 33 percent longer
when viewed on an oscillosco
e.
µs
2
Sample pulse durationTpc
Total deviation%
15
Burst modulation, percentFm
kHz
132
Burst center frequencyFc
ms
150
Recalibration timeTrc
NotesUnitsMaxTypMinDescriptionParameter
4.4 DC Specifications
Vdd = 5.0V, Ta = recommended, Cx = 5pF, Cs = 4.7nF, Ta = recommended range; circuit of Figure 1.1 unless noted
bits8Acquisition resolutionAr
µA±1Input leakage currentIil
2.5mA sourceVVdd-0.5High output voltageVoh
7mA sinkV0.5Low output voltageVol
V3.5High input logic levelVhl
V0.7Low input logic levelVil
V/s100Average supply turn-on slopeVdds
@ V
DD = 3.3V
@ VDD = 2.8V
µA
20
14
Average supply current,
LP mode, keys on burst B only
@ V
DD = 3.3V
@ V
DD = 2.8V
µA
36
24
Average supply current, LP
mode, keys on bursts A and B
only
@ V
DD = 3.3V
@ V
DD = 2.8V
µA
48
34
Average supply current, LP
mode
@ V
DD = 3.3V; 190ms LP mode
@ V
DD = 2.8V; 190ms LP mode
µA
22
15
Average supply current,
LP mode*
Iddl
@ V
DD = 5.0
@ V
DD = 4.0
@ V
DD = 3.3
VDD = 2.8
mA84.2
2.5
1.8
1.4
Average supply current,
normal mode*
Iddn
NotesUnitsMaxTypMinDescriptionParameter
*No spread spectrum circuit
Lq
13 QT1103_3R0.03_0607
